Throw out swimmer moving back to front (7)

I believe the answer is:

emanate

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'throw out' is the definition.
(throw can mean to emanate or give out)

I can't explain the rest of the clue.

(Other definitions for emanate that I've seen before include "Come forth" , "Send out" , "Flow or proceed from" , "Issue or originate from manatee" , "Issue forth, from a source" .)

I've seen this clue in The Independent.

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